Matt, there has been a thread about this not long ago. Try the
archives.
Summarizing I can tell you that the little metal tab (which is only
for protection of the rear element) can be pushed away by using your
thumb with little force needed. After that the 2xA can be mounted
without any risk.
But the better way (optically speaking) to prolong the focusing
distance of the 90mm is by using the frontal 1.7x tele-converter made
for the IS-3 camera.
See Gary's lens tests for details!
Frank van Lindert
Utrecht NL.
On Sun, 26 Mar 2000 00:02:44 -0500, Matt BenDaniel
<matt@xxxxxxxxxxxxxxx> wrote:
>I very gingerly attempted to mate a 90/2 macro to a 2X-A and discovered that
>the 90/2 has a tiny metal tab that seems to have been specifically designed to
>prevent use of the lens with the 2X-A. I infer the reason for that is that if
>the lens were to be focused at infinity, the rear element would come into
>contact with parts in the 2X-A, a potential disaster. (I think older lenses
>like the 55/1.2 do not have this tab feature).
>
>I very gingerly tested the 90/2 with a Tokina doubler and it seems to work
>without any contact occurring. I think it yields a 180/4 1:1 macro.
>
>OK, am I being really stupid here and should I cease and desist this behavior
>immediately?
>Or, am I onto something useful?
>
>Matt BenDaniel
>
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